4. Typewriting machines
  5. Means auxiliary to typewriting function
  6. Frame, casing, or support for typewriter

George J. Eberhardt

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Method of determining detector lifetime using a stepped resistor

Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent

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Method of producing a printer which facilitates clearing a jamme

Typewriting machines – Means auxiliary to typewriting function – Frame – casing – or support for typewriter
Patent

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Optical paper sensing method and apparatus having light source a

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent

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Profile ID: LFUS-PAI-P-417118

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